Electrolytic condenser



Aug. ,20, 1940. n. JACOBS ELECTROLYTIC CONDENSER Filed May 17, 1937 INVENTOR fiaw'd kfacods' 241, ATTORNEYS Patented Aug. 20, 1940 PATENT OFFICE 2,211,780 ELECTROLYTIC CONDENSER,

David Jacobs, New York, N. Y., assignor to Aerovox Corporation, Brooklyn, N. Y., a corporation of New York Application May 17, 1937, Serial No. 143,001

6 Claims.

My present invention relates to electrolytic condensers, more particularly to those of the socalled wet type.

An object of the invention is to afford a secure insulating mount in the can for the anode which shall constitute a liquid tight seal to prevent leakage of electrolyte.

Another object is to provide a mount of the above type of simple and inexpensive construction which may be readily introduced without the need for spinning, rolling or compressing operations,

In the accompanying drawing in which is shown one of various possible embodiments of the several features of the invention,

Fig. 1 is a fragmentary view partly iii section of one embodiment of the invention,

Figs. 2 and 3 are fragmentary sectional views showing successive stages in the assembly of the device, and

Fig. 4 is a perspective view, showing the assembly of riser and plug.

The general construction of the condenser may be entirely conventional, including a metal container I!) having a neck H which may desirably have screw threads to serve for mounting upon a chassis (not shown) with the aid of a nut (not shown). A riser II of conventional construction is mounted in insulating relation with respect to the neck H and has afiixedthereto an anode (not shown), spaced from the can which serves as a cathode, the can being filled with suitable electrolyte liquid and at its upper end having a conventional closure afllxed thereto with any suitable form of vent. The general construction is but briefly and sketchily described because it is quite conventional.

The present invention is concerned entirely with the construction of the liquid tig'ht closure and riser mounting means at the lower end of the device.

According to the invention the neck of the can which is preferably integral with the can structure is extruded to present a thickened wall l3 capable of resisting high normal pressure without distortion. It is preferably provided with a bore that is slightly tapered to present a smaller diameter at its lower or outer end than at its upper or inner end. In a practical application the taper may be about ,5 per inch length of the neck.

The riser is illustratively of a length of wire generally in diameter, flattened at its upper end ll for rivet connection as at l5 to the anode member IS. The lower unflattened portion of the wire is introduced into a corresponding axial bore ll of a flexible rubber plug I8 which has a taper corresponding to that of the inner wall of the neck H and the plug is of length consider ably greater than that of said neck. The riser wire being introduced into the plug,

that assembly is introduced through the upper end of the can so that the plug will readily become seated as best shown in Fig. 2 in the neck, with the lower reduced end of the plug protruding below and the upper large end of the plugprotruding above the neck. Thereupon the protruding end of the rubber plug is grasped by a suitable gripping tool and pulled downward to' the position shown in Fig. 3. In that operation, preferably a suitable marking on the plug, or if desired, a suitable stop in the container aids in determining that the plug has beenpulled out far enough. In this operation as is immediately apparent, the rubber plug is subjected to relatively tremendous wedging pressure, securely to grip the riser wire and to be compressed at its outer periphery by the entire inner area of the neck. In that position as shown, the upper or larger end of the plug protrudes but slightly above the neck and since it has not been subjected to compression by the neck, flares materially in a radial direction into the can while the lower reduced end, which is relieved of the pressure exerted by the neck expands outwardly therebeyond as shown at I9.

The excess length of protruding plug may then be readily cut oil slightly below the bottom of the neck and the usual terminal lug 20 may be applied to the protruding riser end and rest against the protruding plug end.

By the construction set forth it will be seen that a most reliable liquid tight seal is afforded by which the possibility of leakage of electrolyte from the can is substantially precluded. The rubber plug is afilxed with respect to the can and the rod under pressure and with effectiveness at least as great as that accomplished by the most approved cork closures applied in bottling works. Moreover, the protruding ledges l9 and 22 respectively above and below the neck II ail'ord afiirmative stops retaining the plug against longitudinal displacement in addition to the effectiveness of the friction hold thereof with respect to the riser and with respect to the neck.

While as set forth it is perefrred to form the can neck of such thickness as not to be subject to appreciable distention under pressure, it will be understood that the invention as defined by n as in a limiting sense.

the broader claims could be applied with a neck of somewhat weakerv or thinner metal.

While the tapered bore and tapered plug construction set forth have the advantage of a more eifective wedge binding efiect, it will also be understood that results useful within the scope of the invention as more broadly defined could be accomplished with the use of a plug, the neck sealing portion of which is cylindrical with a neck of corresponding bore, the plug being reduced at its lower end for facilityin gripping the same by means of the pulling tool to cause seating thereof. j It is seen that the present construction involves only asingle unitary flexible rubber plug element to effect mount of the riserandthe seal with respect to the can neck. The'com'pressionof the rubber element and the efiectiveness of sealing is far greater than could bejattained iri constructions in which such seal is effected by spinning or rolling a thin metal wall about a rub;

ber liner, not to mention the simplification obtained in the elimination of such mechanical'op-yf erations and the simplification in the construction of the can and of the riser in obviating the need for special fastening instrument'alities thereon. f I

It will thus be seen that thereis herein described apparatus in which the sever'alfieatures of this invention are embodied, andwhich apparatus in its action attains the variousobject's of the invention and is well suited to meet' the requirements of practical use. M

As many changes could be made in the above construction, and many apparently""widely different embodiments of this inventioncouldbe made without departing from the scope therebffit is intended that all matter contained intheabwe description or shown in the accompanyingdrawing shall be interpreted asillustrative-andnot Having thus described my invention, what I claim as new and desire to secure by Letters Pat'- entis: A

1. The method of assembling an el'ectrolytic condenser which consists in passing the-riser through a corresponding central bore of'a tapered rubber plug, inserting the riseriiwithsai'd plug into the can, and grasping the reduced 'end I can for secure fltitheriri j 'lower ends. oiE-the-neckm v :3

of the plug with a tool and drawing it outward through the tapered bore neck of the condens r 2. The method of assembling an electrolytic condenser which consists in passing the riser through a corresponding central bore of a-tapered rubber plug, inserting the riser with said plug into the can, grasping the reduced end'of the plug with a tool and drawing it outward through the tapered bore neck of the condenser can for secure fit therein, and then cutting ofi the excess length of protruding; rubber plug.

The metnb ic xina n an zri into the inwardly tapered neck of the canof an elecrtrolytic condenser, whichconsists in axially slipping a spf trubber plug tapered to correspond with-that ofsaid neck over said riser, introducingsaid assemblyinto the can to cause the plug "to seat ng-shaped; and then pulling said plug outward through isaid neck, tocause the same to be tig tlycompressed between said neck and said electrolytic condenser comprising a can, a neck to said can, an anode riser and a resilient insulating-{plug mounted on "the; lowerlend thereof, wherein the resilient plug iS"l-10ngitudi+ nally under tension, and snugly' en'gagesthefentireinner'areaof the neck' and'thelenc ssed surfacebfthe riserJ 5; An elec'trolytic condenser accordin toclaim 9%, wherein the neck has a contihuousabore etap erin'g "td a 'minimum -diameter at: its I1 free: (end and thef-plug isfcorrespondin'gly' tapered, where.-

' 6. 'Inan electrolytici'condenserthetcombination of a can having an integral mounting necklthereon with a slightly taperedibora; anw anodejingsaid can havin'g'a; riser extendingaxially through said correspondingto that of theizbore rof-f. thegneck encircling said rlser wire; and .:longitudinally;;un,-

der tension; and'iengagingi 'ithe ientire rinner area of the neck and -the encompassed; surface-pf: the riser, the upper and lower ends of saidiplugbeing 1 1 substantially free*sfroms compression and flaring radially outward over thefirespective uppe and 

